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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8082a3a2c976aed17c3e60d9e85234321a5dfcff0b7fbb6a0c61f5277ac0450c' 
  AND token = 'SRFnu9HiF2dZLN0lEjd2AkIgQ9+JmznuXuATWionZ/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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