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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c90b07a0d61dbd817d63b866c61fcb65e62eeaf4c38eb5cc920c248fe9519bb' 
  AND token = 'MafBDXZWF/o4YzeJmB4ExKI9e/f/1RNcd/NaydbyktE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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