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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f037ac3c70d5a3991cd2a47e28a30d3ae1a78d66c3ac6e94446302468e3dcbd7' 
  AND token = 'lxxnH5CW74NEPzMzGHySFOTXecvqr6zohYabnFejw90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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