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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d317327279b5b0c7062472307ac369a8249d383a3994b9b2b25d31ffff560e4' 
  AND token = 'v0S4C3q1S5Nv38aM9O8aX71CtQwaqadqbYKoLHfqhTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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