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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4022d6771a8fa9b3def5cc6e3510352eaf7c5a9a83eaa80eb432832ec6678f1' 
  AND token = '6pNAJ5fYlXP5FLKErhgE0RCVxA5v391c5FKRIUSTB78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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