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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b229e2a57c6a990756559385737bfd0e3cd0173df06b493ab1d9222e8a652033' 
  AND token = '86eYzALIdXv56tdU3Q6N2AHWF9PWf70uGoIFon4r8oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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