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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911ebe09a8eda5f521edb2a0b6eb93061b9b73b41c06e6e734d03685e64062bb' 
  AND token = 'DflSeAlItiP6OYaBnXgHDqHpwtRiakzbQKEMf9jfqqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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