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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1706ef3c02c11648665c4ba655a8f6eaba0c7253d9122ac2badb6b786df37352' 
  AND token = '3MKvcq6PdvR2Dmn3e4jDIZuW6g0MY5f0gKv8xbmWwH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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