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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98021c78e2f74b7d095e32975d3312bc04d8ee8e471def91b0942e9d56a0899f' 
  AND token = 'UsPv60RDe3504BQdV+gExCMj3GffU4vruf3AzSI59Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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