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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0987a637f59f179bec27b129fec6fc5d496dae83ed36d8bced631d1cf42897' 
  AND token = '/BkgJqNIwA/wpb49bQPTkzByivLtW0ApLbGD9z27uMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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