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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b052c48f454558ab07ebfe24b1138228c9c723c4200428703a84bd58fbc2a9' 
  AND token = 'w+BYFgW+ZU2qSoK6II00E4JCrfzrRkEF1Duwt8xm/to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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