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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cdae18e9266108dbd3db2c11c3372b14407e800271f10bf8c12ac1c07815d2' 
  AND token = 'zSzjy+4/mYjLqV30Qrg1yd791lkwbePXi9Iy7JXxA7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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