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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f8458699f2d08c40ad87f08c1a3828fb4fc8684b44164f71f0e951df214254' 
  AND token = 'E0XdEILLjdTqEpfr4lGBXAXZTPLCzCtrZHpTqQi79/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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