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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1515930619c0f60ed901a315c6823134622eb95f9548bdfcf6fc88b835af3a35' 
  AND token = 'uDj2R7MmXDOVueP/A26XSFYY3DQtR9Uw7fGqi507ltc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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