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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030037261a92572aa69ad17067fefce9546083f49aa225476216ff31587dc4d7' 
  AND token = 'vUwsuzGwPbTIVzf78rB9MUJSQjki0EZL9TRnMrjMNjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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