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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34705c7257cac65926ab187f2f11d74d4a3de2d64ff15ea62106c9df0c3947ad' 
  AND token = '197H7P0liC/GRomuzx8AMyKJjb0EvexbVPKicJVlvy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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