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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fcad5e6aca6188bcb91fa2b6bdfa3d836c841280b5c8b2b3cfcedff65c8f2a' 
  AND token = '5RtMO6p4MLI98TtH5QTpu8lMuH2RkwWf6+PBt3GB0qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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