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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff23f9b880047d81a6e7d650aaa42fbd76bead9087b960ebb2c9b1ae827545cf' 
  AND token = '0R8vjz7CGfz3z7i3jX+Res3xPkwsPFGKtgWn9RHHS+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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