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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2715bc7aadb8c262c8b27f9484da79ce477bb211c41c93ceab20cbf990520bd7' 
  AND token = 'nPS87o7xfc30ME+e4ZD2n32PWbGHFYfEvuaAXISb7KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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