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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24175d5eb4bd6f3d338d128a511a31d41f568484ad4dd1764a2bd9b16e91100' 
  AND token = 'Jj6aG6GQF9iFbJBFDGpuivRZw0mp0AQo615l7bb7Le4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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