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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82106f3cf41e1af2c9a7ae6d06dd3838a6762edf269cddbe88cec22c62386eb0' 
  AND token = 'FGEIexJW56++j0OocwhCQKe+66aVUUNLGC+NBLLpCsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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