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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a5386315c6dfe2343470c0e442495fd13528f40004f8074cf5f2585c459cbf' 
  AND token = '5lv88295hxTUw2VbhaHyF1JphbZp5LhirAAm5Yp+ZmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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