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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab88eb5139b7145e7b559541e6fd58a1fb992bd756f0881759770e03b2dc2785' 
  AND token = 'Al5Y9wzTWjivMquvBb07y2xLiYbW9stFeD9SZ1ED1A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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