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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d0f8c5959e8b1bc3b9d67c7a95a564efbaf2674762bb9138efb544424e0fc3' 
  AND token = 'T19c6HVMXWUHa2xKlV6MlM78pn15rT2DIq+xnwXJZ+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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