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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedb070e873056eece35c72e79dc7821e34417b9a1cb73937b2bab90b4bdac94' 
  AND token = 'SRUQPbVdkRpiGPup2/Zzgqdwvy8E19E7vWdws1onyEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}