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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd054cf9075ab794e33aa53d54da5add919c8ce75b941d2f1e4c49df111d903fc' 
  AND token = '2pKmGckDr2UNI/zV2jtwTHO9qHWiPifNzofjRkyEITI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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