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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1185b5990c77fc867c1eb81230ed5039332c60f181fefd3bb7fb9113155137d1' 
  AND token = '+9+Q/pXUfSj4XJdGZAiTttXKf/GD1G/uX78gLMlo9aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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