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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa28d5d8ccde6ea77441e8e1184ee1371c91e6c4dbaaed0105368c48becfef60' 
  AND token = 'JC4TBSkZRLRQ8jCRovZi/dpPqKdbz3yK1vHP7t5/qdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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