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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f1633ca1496b3cd2521accce19f77d241a903b0375b5080106a127a8671999' 
  AND token = 'G0PaVgC5otS555xPdrjxUI4doMZrMa415+HljcolPyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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