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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b979dae5e02d69e7b522e2421369144e64b6fe3d9a7e3f2f389aa9ed7f6c197' 
  AND token = '9MLkprsdfeR0oIep1SyyBlp12il+Qfk6/xwY5Ot75QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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