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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7412af351ab7e31cd008a8bd88166ce76970c110c1bd9578c4283379f4f36a0' 
  AND token = '17MHx6eIiaeQyi6WVJY6Ii7ciWEde/uaNUj1nVy8ehs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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