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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d56ebcf171fc3db17d13dfe511d02a57f460cbbc557ea3235d64b64547e071' 
  AND token = 'INAux8qSIiD1Q+s2BSTcvLE8ppPcLqYjhCy1x8HhmrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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