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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc24ccf9a3670abc11c456f972743bb39c2b398e01b45eaf57d0cb6ff7b76f45' 
  AND token = 'php8/HRcFeXDRwDGhg1QuKChtiaBL6beDMkcbxQxlD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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