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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f10db4e0fe953ce79da5030590b890c170ab4dbe47db5e12ceeb69da0481f79' 
  AND token = 'PQYzY+8BQ6mK5nBJMvcsTb8ryr3TdKePTJOqZpfVySg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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