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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e009c6a79494ca0db6efcce23a36df9379f70b4729ba284b856bf76508f0ab' 
  AND token = 'Gijpfa+y30Z685U6bCfZ0X2WvEyXidjpPoFZEdlMPC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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