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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bac2576ea086ef4d83a46dce6936e37ab8b71f87749932b18d55c19775b6dc4' 
  AND token = '5ROeI0PiZOOGZRPht7Ae5We+2X/uxmKYkoLDEKuSIQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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