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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e0dc2e4886b7899630901ab68e3ced690218a126f7bccdaa4c7f2c99057bc8' 
  AND token = 'eENoSa19/2fieNT4jsWeXmrJ2yBmrNyOO9seKk2uq6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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