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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5de1843f0e2a28098d6a61255cac78ee52a8b3bd8b632d3ebe13b0bfa68bdd9' 
  AND token = 'ewAzL1QAzjYezOCNi5F/c0ev0CjeH7L1dqkXiHMS9ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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