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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3dc296c0890327cf649dbd3c9b10be010f255c4d402581fd1fdf6270dc776d1' 
  AND token = 'db2u4681LJIn7VtBLu4IqxBiRKjfi6KRZKulxuX8ujI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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