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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f497406cfe78678e5eb3654d283a333b476c24834c6db8fc22204d2a1266e9e' 
  AND token = 'Hc6qlpt96V7rF34fdEunhTDcqOvYo5B9eFGuDXfBigY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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