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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2198a8b7aa2f989e3cc2ddf6dcdeddb18c77d301ad9e935ae7d6c0502d14099' 
  AND token = '+q3H7WzIuav6OLQlCLWFFlAi3NHLzPbAyQQHBEItBPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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