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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f420a02e136c4711021d372902cd3eb783760a681ca0c73c5f4a08f9d5928bd4' 
  AND token = '9Pxk8Mb3ltdOwn9trJhBmdhp0+p8bvn6/33R2aROON8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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