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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2e3046596d5fff9aab4041bb43c8af06d192b6d4bf6d465b32588f70341858' 
  AND token = 'ZoqfFPClzIjU8FoUckKxk18+yd/g4fyva1FFwMW46go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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