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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf5ffccadd10f4a1d8d8c31ee4ba4494d0cb3ff7586e0c2ca2ca7fc6a9cbaac' 
  AND token = '4s+cZ/pJBco9qosO538RKt6fXur498shgaFeQrx9UkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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