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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f843715fc40d475faf8c01c77ee316df036c7e602abaa0543de515ecd26de4' 
  AND token = '97jROG1P5JRFhSl/ulMph0dgnAv8q7VIUgB2EGcb2+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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