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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2047f8262f3ef396044949502902d04ed4bb0e34a7ea70292a422d3f2d9146f8' 
  AND token = 'bo0Mz5teYZHp5OB0FSjCiv3rEK3zb5ZduiP4gsxXFC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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