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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fcc42509320a55c05ab6570c747ea32b5c490cf18e7b6765eff970dbf3d9a8' 
  AND token = 'D7EYETmpSGpMFPL4k73m0mkNNKHXe7uPTPtNBCdJ6ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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