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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820199225c94508abd4754c32729694fc3a2df885b090555785facd2c1467435' 
  AND token = 'SrrJWHc7JMllIKuNfTlGu/sx5ChTqOV7x46FVML0R4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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