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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c64150e3dbdd45ca9168f8901c2b9b744cfbe6a53ac5af36fc8ee311d53de8' 
  AND token = 'dxziU5sPPgHkAKV4yQ/D85kSS8awRhhE82X/LTbxOhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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