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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0447088af2548d99d3a6d8002a03d285a2453c23993a006e0cc76ca357b1cd' 
  AND token = '4eG7Boh6zl1ZT8g7yXwMwJHwAVYBshk8d4PqAQwXRQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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