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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76f98e8a47f30e9bf2faa2aeab2d43ebe7728581fe592d4288c70ff7781e7ac' 
  AND token = 'VwOcVjbbcYgNLHEo6Ta7+eE8yCbzR+VSSQKVv7leerM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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