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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d91c9f1a831bf1522e0f5c6a266ed622ccdf79f2ff6bd95dc5b7f520a05a83' 
  AND token = 'U29Y3/1Te20gLtTzBlJJC6zrtwjhT8kmP4PaQjcoZ3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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