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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4eca1518ea6da932d0a41a9de190f462f7bc1abd350a57df16cf9b2a5871a59' 
  AND token = '6FvTKRY3d56okTLUCY1cFvpnET+N1a01pBndYi65E4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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