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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3038f1d9646e24971545458f06cfff98bf4f0d15c5ce67e45dd572aadb5ab4' 
  AND token = 'tbEN7SsiITcFDdaweKk+lZLODvbdiiRIYQJjhQPSj7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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