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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03d2314496fd20a9cd21c91addce8c878b513e8c13e7bb99994b68a6de1e0f8' 
  AND token = 'GzHlWSeENEZTgyCBS0bxOtzdDBMhDqZHKd8BR60/1eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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