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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4882b6308fea23aa25e2e1d1f4d8a0a9c1d1f2b754bca19cf7f74fe6fa5785c7' 
  AND token = 'oEKSVqWOYy31QhztGHOkUd7Q12J0arxxdlMuJlD9RXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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