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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d8e0779ab1c573c6fa74f4759cd250606116c3b5e5fd8e045a7ba9ca828a43' 
  AND token = 'A9pyhMfyNAJsFSZ16XJZJac8pajZgWO8w3C9NPr5y/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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