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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fc4c42db57df3d67fd3889ff4f61ea8f76d34a520c69b77aa8def2698b0df6' 
  AND token = 'eBkYybCWuFRyREPCa2Ww+KuhWS+zbojbc6uH6VcoID4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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