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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4784c56e4b547fb056772854ae8d2def04782f7e821929eff17b5702aa5983' 
  AND token = 'ST0S7l6LGf3MzUmOYeRVW+0CCbhs9faI+IRi9Wq5wJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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